US3573529A - Faceplate of thin-window recording tube having intermediate sheet of smaller refractive index than the face plate - Google Patents

Faceplate of thin-window recording tube having intermediate sheet of smaller refractive index than the face plate Download PDF

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Publication number
US3573529A
US3573529A US3573529DA US3573529A US 3573529 A US3573529 A US 3573529A US 3573529D A US3573529D A US 3573529DA US 3573529 A US3573529 A US 3573529A
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Prior art keywords
glass sheet
faceplate
thin
refractive index
fluorescent layer
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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Kaoru Tomii
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Panasonic Corp
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Panasonic Corp
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18Luminescent screens
    • H01J29/28Luminescent screens with protective, conductive or reflective layers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18Luminescent screens
    • H01J29/24Supports for luminescent material
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86Vessels; Containers; Vacuum locks
    • H01J29/89Optical or photographic arrangements structurally combined or co-operating with the vessel
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00Details of cathode ray tubes or electron beam tubes
    • H01J2229/89Optical components associated with the vessel
    • H01J2229/8913Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
    • H01J2229/8916Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices inside the vessel

Abstract

An improved faceplate of a thin-window recording tube having an additional glass sheet interposed between the outermost glass sheet and fluorescent layer. The faceplate offers increased resolution due to minimized diffusion of the output luminescent light with the refractive index of the intermediate glass sheet smaller than that of the outermost glass sheet.

Description

United States Patent lnventor Kaoru Tomii Tokyo, Japan Appl. No. 833,254 Filed June 16, 1969 Patented Apr. 6, 1971 Assignee Matsushita Electric Industrial Co. Ltd.

Osaka, Japan Priority Oct. 2, 1968 Japan 43/72345 FACEPLATE OF THIN-WINDOW RECORDING TUBE HAVING INTERMEDIATE SHEET OF SMALLER REFRACTIVE INDEX THAN THE FACE I PLATE 3 Claims, 4 Drawing Figs.

US. Cl 313/92, 313/110, 346/110 Int. Cl ..H0lj 29/18, HOlj 5/16 [50] Field of Search 313/92, 111, 112, 110, 64(All),92 (PF); 250/217; 346/110,(Hartway Group), 282; 350/162 [56] References Cited I UNITED STATES PATENTS 2,476,619 7/1949 Nicoll 313/92 3,027,219 3/ 1962 Bradley 346/1 10 3,141,106 7/1964 Kapany 313/92 Primary Examiner.lohn Kominski Assistant Examiner-V. Lafranchi Attorney-Stevens, Davis, Miller and Mosher ABSTRACT: An improved faceplate of a thin-window recording tube having an additional glass sheet interposed between the outermost glass sheet and fluorescent layer. The faceplate offers increased resolution due to minimized diffusion of the output luminescent light with the refractive index of the intermediate glass sheet smaller than that of the outermost glass sheet.

Patented April 6, 1971 Z a F FACEPLATE F THIN-WINDOW RECORDING TUBE HAVING INTERMEDIATE SHEET OF SMALLER REFRACTIVE INDEX THAN THE FACE PLATE The invention relates generally to improvement in the faceplate of a thin-window recording tube and, more particu larly, to improvement in the configuration of the faceplate of a thin-window recording tube, which faceplate features significantly lessened diffusion of the output luminescent light evolved from the fluorescent layer of the faceplate.

The faceplate of a thin-window recording tube as heretofore proposed is composed of a microsheet of glass (or mica is desired), a fluorescent layer of phosphor material applied through coating on the inner face of the glass sheet, and an aluminized backing attached to the inner face of the fluorescent layer.

The luminescence caused by the impingement of electron beams onto the layer of phosphor material is generally regarded as perfect diffused light and, hence, the radiation angle characteristics thereof can be expressed as follows: [(0) =acos6 I-a)cos0 [l R(0)], where a: optical contact coefficient between the phosphor particles and glass sheet;

6': angle of the radiation within the glass sheet.

It will be understood from the above equation that, in orde to improve the resolution, it is important to have the glass sheet rendered as thin as possible. Such a reduction in the thickness of the glass sheet will, however, be reflected by critical decrease in the mechanical strength of the faceplate as a whole. For the purpose of improving the resolution without impairing the mechanical strength of the faceplate, it is advantageous to have the faceplate configured in such a manner that the diffusion of the luminescent light evolved from the phosphor particles is reduced to a minimum.

This is accomplished in the present invention through provision of an additional, intermediate layer of glass (or mica) sheet between the outermost glass sheet and the fluorescent layer, the intermediate layer having a smaller refractive index than the outermost glass sheet, as will be described in more detail.

In the drawing:

FIG. 1 shows the configuration of and radiation angle of the luminescent light in a faceplate of the prior art;

FIG. 2 shows the section of the faceplate configured according to the invention;

FIG. 3 is similar to flG. l but shows the case of FIG. 2; and

FIG. 4 shows a modification of the configuration of the faceplate of fIG. 2.

Now, referring to FIG. 1 which shows the configuration of the faceplate of a conventional type, the outermost glass sheet 1 is superposed direct on the fluorescent layer 2 of phosphor material so that the luminescent light emitted from the layer 2 radiates at a considerable angle 0' if the refractive index of the glass sheet is assumed to be m.

According to the invention, as illustrated in FIG. 2, there is interposed between the glass sheet 1 and fluorescent layer 2 an intermediate glass sheet 3 whose refractive index n, is smaller than that of the glass sheet 1, viz., n, 21,.

With the faceplate according to the invention thus constructed and arranged, the luminescent light emitted eventually from the outermost glass sheet 1 will advance in a direction as illustrated in FIG. 3. As seen from FIG. 3, the angle of radiation 0" of the luminescent light is significantly reduced with the refractive index n smaller than the index n of the glass sheet 1.

Designated at 4 is an aluminized backing which is usually attached internally to the fluorescent layer 2.

By preferance, the intermediate glass sheet 3 may be formed of two or more layers having refractive indices that decreases successively toward the outermost glass sheet 1. FIG. 4 shows an example of such configuration wherein the intermediate glass sheet 3' is shown to be composed of two layers 3a and 3'b, the refractive index of the layer 3'a being smaller than that of the layer 3'b. I

It WI now be apparen from the foregoing description that the faceplate according to the invention is advantageous for reducing the diflusion of the luminescent light without afiecting the mechanical strength of the faceplate in its entirety.

lclaim:

l. A faceplate of thin-window recording tube, comprising an outermost glass sheet, an intermediate glass sheet adhered to the inner face of said outermost glass sheet, the refractive index of the latter being smaller than that of the former, a fluorescent layer of phosphor material disposed on the inner face of said intermediate glass sheet, and an aluminized backing adhered to the inner face of said fluorescent layer.

2. A faceplate according to claim 1, in which said intermediate glass sheet comprises a plurality of layers having refractive indices that decrease successively toward said outermost glass sheet,

3. A combination of a faceplate of thin-window recording tube comprising an outermost glass sheet, a fluorescent layer of phosphors and an aluminized backing adhered to said fluorescent layer, with an intermediate glass sheet which is interposed between said outermost glass sheet and fluorescent layer and which possesses a smaller refractive index than said outermost glass sheet.

H035 (Hil

Claims (3)

1. A faceplate of thin-window recording tube, comprising an outermost glass sheet, an intermediate glass sheet adhered to the inner face of said outermost glass sheet, the refractive index of the latter being smaller than that of the former, a fluorescent layer of phosphor material disposed on the inner face of said intermediate glass sheet, and an aluminized backing adhered to the inner face of said fluorescent layer.
2. A faceplate according to claim 1, in which said intermediate glass sheet comprises a plurality of layers having refractive indices that decrease successively toward said outermost glass sheet.
3. A combination of a faceplate of thin-window recording tube comprising an outermost glass sheet, a fluorescent layer of phosphors and an aluminized backing adhered to said fluorescent layer, with an intermediate glass sheet which is interposed between said outermost glass sheet and fluorescent layer and which possesses a smaller refractive index than said outermost glass sheet.
US3573529A 1968-10-02 1969-06-16 Faceplate of thin-window recording tube having intermediate sheet of smaller refractive index than the face plate Expired - Lifetime US3573529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7234568A JPS4918032B1 (en) 1968-10-02 1968-10-02

Publications (1)

Publication Number Publication Date
US3573529A true US3573529A (en) 1971-04-06

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ID=13486607

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US3573529A Expired - Lifetime US3573529A (en) 1968-10-02 1969-06-16 Faceplate of thin-window recording tube having intermediate sheet of smaller refractive index than the face plate

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US (1) US3573529A (en)
JP (1) JPS4918032B1 (en)
DE (1) DE1931404A1 (en)
FR (1) FR2019633A1 (en)
GB (1) GB1260009A (en)
NL (1) NL153021B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310784A (en) * 1979-05-07 1982-01-12 Anthon Erik W Cathode ray tube face plate construction for suppressing the halo and method
US4310783A (en) * 1979-05-07 1982-01-12 Temple Michael D Cathode ray tube face plate construction for suppressing the halo having a low reflection and method
EP1100129A2 (en) * 1999-11-10 2001-05-16 Matsushita Electric Works, Ltd. Substrate for light emitting device, light emitting device and process for production of light emitting device
US6762553B1 (en) 1999-11-10 2004-07-13 Matsushita Electric Works, Ltd. Substrate for light emitting device, light emitting device and process for production of light emitting device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476619A (en) * 1946-08-23 1949-07-19 Rca Corp Cascade phosphor screen
US3027219A (en) * 1958-12-19 1962-03-27 Philco Corp Electro-optical signal transducer system
US3141106A (en) * 1958-12-12 1964-07-14 American Optical Corp Image transmitting screen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476619A (en) * 1946-08-23 1949-07-19 Rca Corp Cascade phosphor screen
US3141106A (en) * 1958-12-12 1964-07-14 American Optical Corp Image transmitting screen
US3027219A (en) * 1958-12-19 1962-03-27 Philco Corp Electro-optical signal transducer system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310784A (en) * 1979-05-07 1982-01-12 Anthon Erik W Cathode ray tube face plate construction for suppressing the halo and method
US4310783A (en) * 1979-05-07 1982-01-12 Temple Michael D Cathode ray tube face plate construction for suppressing the halo having a low reflection and method
EP1100129A2 (en) * 1999-11-10 2001-05-16 Matsushita Electric Works, Ltd. Substrate for light emitting device, light emitting device and process for production of light emitting device
EP1100129A3 (en) * 1999-11-10 2003-10-01 Matsushita Electric Works, Ltd. Substrate for light emitting device, light emitting device and process for production of light emitting device
US6762553B1 (en) 1999-11-10 2004-07-13 Matsushita Electric Works, Ltd. Substrate for light emitting device, light emitting device and process for production of light emitting device

Also Published As

Publication number Publication date Type
NL153021B (en) 1977-04-15 application
NL6909714A (en) 1970-04-06 application
GB1260009A (en) 1972-01-12 application
JPS4918032B1 (en) 1974-05-07 grant
DE1931404A1 (en) 1970-04-23 application
FR2019633A1 (en) 1970-07-03 application

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